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Date: Sun, 30 Mar 2003 20:52:57 +0100
From: Grunff <grunffnopsam.com>
Subject: Re: Hard(er) question (Was: Odd knob, no markings...what is it?)


Hogan Whittall wrote: > Ok, for the mystery...my 91 900 5spd has a transaxle drainplug. Apparently > the drainplugs went away in 1990 or thereabouts? So the mystery is, why > does mine have one? It's not one that someone drilled and tapped, it's > factory. The transaxle part # on the cover matches the car and year, the > VIN on it matches the rest of the car. The only thing I can think of is > that either a) US-spec cars got them or b) my 900 got a left over 1990 > transaxle. The guys over on saabnet.com couldn't explain it, just that > "your year doesn't have drainplugs." ;) You're right - it shouldn't have one, but it obviously does. That happens sometimes, left over parts, that kind of thing. > While we're on transaxles, will synthetic oil do anything to cure the lazy > syncros on 1-2 shifts? How about adjusting the clutch, going into 1st or > reverse often results in a *thud*, typically to get into 1st at a stop I'll > touch on 2nd gear and then move into 1st. Acts like the clutch isn't fully > disengaging. You can't adjust the clutch, it either works or it doesn't. If it doesn't, then it's probably air in the system, or possibly a failing master or slave. Alternatively it could be a worn linkage. When you put your foot on the pedal, do you feel resistance right from the top? An inch from the top? Two inches? > Another mystery...erratic boost. My gut tells me the APC solenoid for the > wastegate isn't doing its thing right. Often times I'll only get 1/3 into > the orange, sometimes it'll go right up to the red, other times it'll head > to the red and then drop back down to 1/3rd. The weirdest only happened one > trip, but at part throttle and marginal boost the gauge would waver from > boost to no boost and back again. It's not the gauge, I can feel the car's > speed change at the same time and I haven't changed how much throttle I'm > giving it. I've checked the electrical connections, everything is clean. > Maybe it's coincidence, but if I pull over, unplug the solenoid and then > plug it back in that seems to fix it, if only temporarily. Sometimes when I > plug it back in the solenoid will click about 20 times and then stop. My > vacuum lines and intake hoses are tight with no cracks, this is something > somewhere messing with the wastegate. The other weird thing is when I do > get decent boost it's not always the same amount. When I'm lucky the needle > will sit right on the line where red and orange meet, other times it'll be > down a couple of needle widths. Only thing I can think of is with 146k > miles, the solenoid isn't holding shut under boost as well as it used to and > pressure is leaking past, opening the wastegate and killing my boost. > Possible? Heard of this happen before? Does sound like it could be the APC. Maybe borrow one and do a swap-test? -- Grunff

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